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Context: Docker bypasses all UFW firewall rules
(lemmy.world)
Docker docs:
Docker routes container traffic in the nat table, which means that packets are diverted before it reaches the INPUT and OUTPUT chains that ufw uses. Packets are routed before the firewall rules can be applied, effectively ignoring your firewall configuration.
I put off docker for a long time for similar reasons but what won me over is docker volumes and how easy they make it to migrate services to another machine without having to deal with all the different config/data paths.